"Reportedly Ronin Capital was unable to meet capital requirements at CME today; regulators were forced to step in and auction off Ronin's assets" *RONIN CAPITAL ISSUES DEAL WITH POSITIONS IN THE VIX, CNBC SAYS .
Without reading the article, just a guess, another case of leverage and bull run, meeting each other in 100% correlated-long portfolio and reality giving it quick kiss.
What do you mean by "pulled"? Did the pu$$ies not provide anymore market? Because this is what pu$$ies do usually in high-vola times...